Fix non-NixOS installer branch: auto-detect arch and use correct home config target

flake.nix

@@ -189,7 +189,17 @@
 
           if [ "$ID" != "nixos" ]; then
             echo "Not on NixOS - installing home-manager only"
-            home-manager switch --flake "$FLAKE_DIR#youruser@linux"
+            ARCH=$(uname -m)
+            case "$ARCH" in
+              x86_64)  HM_TARGET="eliaskohout@linux" ;;
+              aarch64) HM_TARGET="eliaskohout@linux-arm" ;;
+              *)
+                echo "Unsupported architecture: $ARCH"
+                exit 1
+                ;;
+            esac
+            echo "Detected architecture: $ARCH -> using config: $HM_TARGET"
+            home-manager switch --flake "$FLAKE_DIR#$HM_TARGET"
             echo "Home manager configured"
             exit 0
           fi